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- Steinar Evje, Tore Flåtten
- SIAM J. Scientific Computing
- 2005

The aim of this paper is to construct semi-implicit numerical schemes for a two-phase (two-fluid) flow model, allowing for violation of the CFL criterion for sonic waves while maintaining a high level of accuracy and stability on volume fraction waves. By using an appropriate hybridization of a robust implicit flux and an upwind explicit flux, we obtain a… (More)

- Tore Flåtten, Alexandre Morin, Svend Tollak Munkejord
- SIAM Journal of Applied Mathematics
- 2010

We consider systems of hyperbolic balance laws governing flows of an arbitrary number of components equipped with general equations of state. The components are assumed to be immiscible. We compare two such models; one in which thermal equilibrium is attained trough a relaxation procedure, and a fully relaxed model in which equal temperatures are… (More)

- Steinar Evje, Tore Flåtten
- SIAM Journal of Applied Mathematics
- 2007

We explore the relationship between two common two-phase flow models, usually denoted as the two-fluid and drift-flux models. They differ in their mathematical description of momentum transfer between the phases. In this paper we provide a framework in which these two model formulations are unified. The drift-flux model employs a mixture momentum equation… (More)

- Steinar Evje, Tore Flåtten
- J. Sci. Comput.
- 2006

In this paper we propose a class of linearly implicit numerical schemes for a two-phase flow model, allowing for violation of the CFL-criterion for all waves. we here develop an extension denoted as Strongly Implicit Mixture Flux (SIMF). Whereas the WIMF schemes are restricted by a weak CFL condition which relates time steps to the fluid velocity, the SIMF… (More)

We consider a hyperbolic system of conservation laws describing multicomponent flows through a transport pipeline, with applications to CO 2 transport and storage. We demonstrate that numerical dissipation easily leads to an underestimation of the amplitude of pressure pulses and the resulting pipe strain. We argue that recently developed high-resolution… (More)

- Tore Flåtten, Alexandre Morin, Svend Tollak Munkejord
- SIAM Journal of Applied Mathematics
- 2011

We consider an isolated system of N immiscible fluids, each following a stiffened-gas equation of state. We consider the problem of calculating equilibrium states from the conserved fluid-mechanical properties, i.e., the partial densities and internal energies. We consider two cases; in each case mechanical equilibrium is assumed, but the fluids may or may… (More)

- Svend Tollak Munkejord, Steinar Evje, Tore Flåtten
- SIAM J. Scientific Computing
- 2009

We present a multi-stage centred scheme, of the kind proposed by Toro [Appl. Numer. Math. 56 (2006) 1464], for numerically resolving the simultaneous flow of two fluids through a transport pipeline. This model contains non-conservative terms in both the temporal and spatial derivatives, and an extension of the standard numerical framework for conservation… (More)

- Ulf Jakob F. Aarsnes, Tore Flåtten, Ole Morten Aamo
- Annual Reviews in Control
- 2016

- Sofia Lindqvist, Peder Aursand, Tore Flåtten, Anders Aase Solberg
- SIAM J. Numerical Analysis
- 2016

- Gunhild Allard Reigstad, Tore Flåtten
- ENUMATH
- 2013

This paper deals with the issue of how to properly model fluid flow in pipe junctions. In particular we investigate the numerical results from three alternative network models, all three based on the isothermal Euler equations. Using two different test cases, we focus on the physical validity of simulation results from each of the models. Unphysical… (More)

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